(C) in nonferrous melting furnaces, only the following metals
are melted, poured, or held in a molten state:

(i) aluminum or any alloy containing over 50% aluminum;

(ii) magnesium or any alloy containing over 50% magnesium;

(iii) tin or any alloy containing over 50% tin;

(iv) zinc or any alloy containing over 50% zinc;

(v) copper;

(vi) precious metals;

(D) no lead, leaded brass, leaded bronze, or magnesium bronze is
melted, poured, or held in a molten state;

(2) aluminum melting or holding furnaces with a holding capacity
of 2,000 pounds or less that melt only clean aluminum ingots or
pigs and in which no refining, smelting, metal separation,
sweating, distilling, or fluxing is performed.

106.322 Furnaces to Reclaim
Aluminum or Copper (Previously SE 96)

Dry hearth reverberatory type holding chamber aluminum or copper
metal reclamation/sweat furnaces in which no fluxing, degassing, or
refining is conducted, which operate according to the following
conditions and limitations of this section are exempt.

(4) The furnace shall be equipped with an afterburner which will
provide a minimum retention time of 0.1 second at a minimum
temperature of 1,300 degrees Fahrenheit for all furnace exhaust
gases.

(5) The incineration of any insulated wire or cable containing
chlorine compounds in the insulation, such as polyvinyl chloride
insulation, is expressly prohibited.

(6) The owner or operator of the furnace shall initiate and
maintain a program of furnace operator training in the recognition
of chlorine-bearing wire or cable insulation and shall demonstrate,
upon request by the executive director, acceptable proficiency in
the recognition of chlorine-bearing wire or cable insulation such
as polyvinyl chloride insulation.

(7) Fuel for the furnace shall be sweet natural gas as defined
in Chapter 101 of this title (relating to General Rules) or liquid
petroleum gas, diesel, or Number 2 fuel oil.

(8) Before construction begins, the facility shall be registered
with the commission's Office of Air Quality in Austin using Form
PI-7.